Cut-out for electric circuits



(No Model.)

H. O. MoDILL.

GUT-OUT FOR BLEGTRIG CIRCUITS.

Patented Oct. 30, 1888.

N, PEIERS. PhalmLnhugnphcr. Washington D c:

UNITED STATES Parent HENRY G MODILL, OF FORT WORTH, TEXAS.

CUT-CUT FOR ELECTREC ClRCUITS.

SPECIFICATION forming part of Letters Patent No. 391,853, dated Oct r Application filed September 9, 1887. Serial No. 249,248. (No lllOKivl.)

To all whom it may concern:

Be it known that I, HENRY 0. MODEL, a citizen of the United States, residing at Fort \Vorth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Out-Outs for Flcetric Oircuits, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it apperta-ins to make and use the same, reference being had to the accompanying drawing, forming part of this specification.

My invention relates more particularly to cut-outs for incandescent electric lamps; and it consists in certain novel features which will he described in detail, and then pointed outin the claims appended hereto.

The accompanying drawing shows an isometric projection of a cut-out embodying the principle of my invention.

A designates the filament of a lamp, and L L the leadingin wires, the direction of the current being illustrated by arrows.

Q may be the positive bindingpost, and N the negative.

B is an insulating-base upon which the parts are mounted. Upon this base is arranged an upright, O, which carries a solenoid or magnet, FG, on a horizontal extension. Thissolenoid is wound with two coils, the one, F, of coarse wire, equal in resistance to the filament, and the othereoil, G, made of fine wire, and has many turns and many times the resistance of the filament or coil F. One end of coil F isin electrical communication with binding-post Q, and the other end thereof joined to standard (3, and one end of coil G by a screw, 0. The other end of the col G is attached to thebindlug-post N. The filament of the lamp is attached at one end to a binding-post, N, be tween which and the binding-post N are contact-springs M, normally completing the circuit between the two.

To the upright O is swiveled a cross-arm or armature-lever, D, bearing the core E of the solenoid F G at one end. The other end is provided with an extension carrying an insulating-plate, P, on one side.

Mounted upon the upright G, and pivoted above the cross-arm D, so as to bear upon it, is a cam, K, having its pivot extended and affixed to a milledhead, I, for manual operation.

Normally the parts are disposed as represented. The current flows from the positive binding-post Q, over the filament to binding post N, via the springcontaets M, to the negative bindingpost N to line. A small portion of the current travels over the solenoid F G from binding-post Q, to bindingpost N, and forms a derived circuit to the filament with the coils F and G in series. The current passing by this route is not suiiicient to energize the solenoid to the degree required to draw up the core. Should the filament fail from any cause, the current will be caused to traverse the path last mentioned, the solenoid will become strongly magnetized, the core drawn up, and the end of the cross-arm carrying the insulated plate upon one side inserted between the spring-contacts M, The current will then be through the coarsewirc coil F to standard G, cross arm D, via the spring-contact M, connected with the binding-post N to line, the fine-wire coil G being cut out. It will thus be seen that the coil F, having a resistance equal to the filament, is substituted for the filament, and the resistance of the circuit maintained constant, giving rise to no disturbance of potential.

If itis desired at any time to cut the filament out or to throw the current upon it when out out, the cam K may be operated manually in either direction for this purpose by the milled head I.

It will be evident that the various devices and the arrangement I have described may be varied in many ways without departing from the spirit of my invention. 1 do not wish, therefore, to confine myself to the exact mechanism described; but

What I wish to claim and secure by Letters Patent of the United States is l. A cut-out for an incandescent lamp embodying, essentially, a magnet or solenoid in derivation from the filament, spring-contacts completing the circuit from theiilament to the line on one side, and an armature-lever electrically connected with said magnet adapted to disrupt the circuit between said contacts and maintain the continuity of the circuit through itself.

2. The combination of the filament A, connected at one side to the line by the spring contacts M, the coils F and G, of low and high resistance, respectively, in series in a derived circuit from said filament,the former coil equal in resistance to said filament, an armature-1ever in electrical connection with one terminal of coil F, carrying an insulating-plate at the place where adapted to pass between said terminals.

3. The combination of the filament A, connected at one side to the line by spring-contacts M, the coils F G, of low and high resistance, respectively, in series in a derived circuit from said filament, the former coil equal in resistance to said filament, standard 0, carrying armature or cr0ss-arm D, having insu- H. O, MoDILL. [L. s]

Witnesses:

A. D. ANSELL, J. H. HILL. 

